obviously you know tax day may be a protest but if tax day and you were protesting the government you would want to hit a government facility. my leaning is that considering the person of interest who they picked up and not necessarily guilty i want to add is of foreign origin that this looks like it's leaning toward that direction. >> do you have a sense of how these bombs were coordinated? we're hearing that there were the number floats but there were multiple other unexploded devices that were found? two that we know exploded. you know this is just from a layman's perspective who probably watched too many movies in the past but are there timers involved and would timers tell you something different than something that could be activated with a cell phone? >> first of all every bomb has a signature and there are bomb experts that specialize in unraveling the signatures to determine who made the bomb. and so some of these bombs may already have revealed who their perpetrators were or who their manufacturers were in terms of the explosives or the timers they used or in the type of inc